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(No Model.) 2 sheets-sheet 1.

H. G. VOIGHT.

MASTER KBY'PIN LUCK.

No. 587,564. Patented Aug. 3,1897.

ggigpfm M# www (No Model.) 2 Sheets-Sheet 2.

H. G. VOIGHT. MASTER KEY PIN LOCK.

No. 587,564. v D Patented Aug. 3,1897` Hbf/755555 LVEUUF UNITED STATESPATENT OFFICE.

HENRY Gr. YOIGIIT, OF NEW BRITATN, CONNECTICUT, ASSIGNOR TO THE RUSSELLd: ERVIN MANUFACTURING COMPANY, OF SAME PLACE.

MASTER-KEY PIN-LOCK.

SPECIFICATION forming part of Letters Patent No. 587,564, dated August3, 1897'.

Application tiled March 25, 1897. Serial No. 629,175. (No model.)

To all '1f/'hom it may concern:

Be it known that I, HENRY G. VorGHT, a citizen of the United States,residing at New Britain, in the county of Hartford and State ofConnecticut,have invented certain new and useful Improvements inMaster-Key Cylinder-Locks, of which the following is a specification.

My invention relates to improvements in master-key cylinderlocks; andthe main object of my improvement is to arrange the pintumblers forbringing their divisions all upon one line when a special key is usedand on different lines when the master-key is used. In the accompanyingdrawings, Figure l is a front elevation of my lock. Fig. 2 is a rearelevation of the same. Fig. 3 isa longitudinal section thereof, partlyin elevation, on the line .fr of Fig. l, together with a special keyproperly inserted therein ready to turn the plug. Fig. 4 is a like viewwithout any key. Fig. 5 is a like view with the master-key inserted inthe lock ready to turn the plug. Fig. 6 is a horizontal section, partlyin elevation, on the line gj y of Fig. 2. Fig. 7 is a front elevation ofthe case with the plug removed. Fig. 8 is a sectional view of the caseon the line z z of Fig. 7, showing the upper portion of said case; andFig. D is a detached view of one of the holding-wings for the plug.

A designates the case, having the case-tumblers 1 2 3 4 5 6 and springs1l substantially as in other locks of thisclass, and B is the plug orcylinder fitted within the bore of said case. A longitudinal groove l2is formed in said case in line with the inner ends of itstumbler-recesses 13, Fig. 8, and tumblers, the said groove being thefull wid th of the diameter of said tumblers. The plug B is dividedtransversely into two parts, the front tumblerbearing portion having theplug or cylinder tumblers a b c d e f set therein, while the rear partcarries the usual wing or dog l5 for acting on the lock-bolt. (Notshown.) Said rear part of the cylinder is provided with an annulargroove, and the case is provided with holding win gs or plates 14,extended into said groove and secured to the case in any propermanner-for example, by screws lf3- whereby the plug or cylinder may berotated in the Case under certain conditions, but its rear part cannotbe moved longitudinally in the case to any appreciable degree. The rearand front parts of the plug or cylinder are held together so as tonecessitate their simultaneous rotation and at the same time permit anindependent longitudinal movement of the front part. This isaccomplished by means of the screws 17, which pass loosely through holesin the said rear part and are snugly screwed into holes in the frontpart, so that the said screw may move longitudinally with said frontpart, while the rear part does not so move. The `cylinder or plug isalso provided with the usual keyway 18, either with or without guards 19and20.` The cylinder or plug is also provided 'with'three'circumferential grooves 2l, 22, and 23, each groove being of awidth tolet the pin-tumblers pass through it, or, rather, let the grooves passby the tumblers, as one end thereof rests within said groove. Thetumbler-sockets are so arranged that when the forward end of the plug isat the extreme end of its outward movement the sockets and tumblers inthe case and plug correctly register with each other, and thedivision-line of all the tumblers when the plug is in this position mustbe on the line of its. main periphery.

TheV grooves 2l 22 23 are each formed a little forward'of theirrespective tumbler-sockets, so that there is a partial tumbler-socket onone side of each groove, and when the forward'end of the'plug is at thelimit of its inward movement the grooves will register with theirnearest case-tumbler, and the divisionlineof such tuinblers must now beat the bottom of said grooves. In the confronting faces of the front andrear parts of the plug or cyl' inder is a special tumbler-socket 24:,having shoulders 25 above its lower end, the socket lbelow saidshoulders beingof such diameter stantially fill it, so that the outer orfront end of the plug cannot be moved inwardly until said tumbler islifted up out of the way and lifted high enough so that its lower endmay be above the shoulders 25, as shown in Fig.

IOO

o. If desired, instead of a pin-tumbler the not move the specialtumbler.

ing faces of the front and rear parts of the plug, so that the saidfront part cannot move longitudinally. The change-key maynow beinserted, and it is made so short that it does The tu mblers areoperated by this key so that the division between all of the case andcylinder tu mblers is on the periphery of the plug, as shown in Fig. 3.the same suit or set the changes are made in the tumblers la, 3c, and5e, leaving the tumblers 2b, 4d, and 6 f the same in all of the locks.

The master-key is longerv than the changekey,V so that when inserted itlifts the special tumbler 26 up above the shoulders 25 to permit thefront part of the cylinder or plug to be forced inwardly into theposition shown in Fig. 5. The fact that the tumblers of the plug andcase are slightly out of longitudinal alinement does not materiallychange their action. It is obvious that the 4several tumblers must moveup and down as the keys are being inserted with a tendency to force thecylinder or plug inwardly, and if the plugtumblers should enter theround portion of the tumbler-sockets in the case they would be liable tobind therein and prevent the inward movement of the plug. The groove l2is for the purpose of preventing such binding. This groove is deepenough so that the ends of the cylinder or plug tumblers are neverforced into the tumbler-sockets in the case lying above said groove, andat the same time it is narrow enough to hold the cylinder or plugagainst rotation when the casetumblers enter it, the width of saidgroove corresponding with the diameter of said tumblers.

The master-key brings the ends of the tumblers 2b, 4d, and (if to theperiphery of the plug the same as the change-key, while the ends of thetumblers la, 3c, and 5e are even with the bottoms of the grooves 2l 2223. It is necessary to notch the back of the masterl key, as at 29 303l, to register with the said grooves and permit the back of the key topass the projecting ends of the case-tumblers l, 3, and 5. Uponwithdrawing `the masterkey the forward part of the plug is pulled outagain andthe special tumbler 26 drops down between the two parts of theplug to lock For other change-locks belonging to it against longitudinalmovement when the change-key is used.

I claim as my invention- 1. A cylinder-lock having its plug or cylinlder divided transversely but connected for rotating together, the partbearing the plugtumblers being adapted to move longitudinally foroperating in one of its positions With the change-keys and in its otherposition with the master-key substantially as described.

2. A cylinder-lock having a plug provided with circumferential grooves alittle to one side of part of its tumbler-sockets, the case, the plugand case tumblers, and means for moving said plug longitudinally tobring the ends of the plug-tumblers int'o position for operating eitheron the line of the main periphery'of the plug or at the bottom of saidgrooves as desired.

3. A cylinder-lock having its plug divided transversely with one partarranged to move f longitudinally, the special tumbler arranged to wedgebetween said two parts and holdthe f plug against longitudinal movement,and also to be removed therefrom by a key when'it is 85 desired to movethe plug longitudinally sub stantially as described.

4. The combination of the case, plug, case A and plug tu'mblers, thesaid plug being divided transversely with its `two parts connected torotate together while the tumblerbearing portion may movelongitudinally, and means substantially asdescribed for locking thelongitudinally-moving part of said plug against longitudinal movementwhen the change-key is used and for unlocking to permit a ,longitudinalmovement thereof when the master-key is inserted substantially asdescribed.

5. The combination of the case having alonroc gitudinal groove in theline of the inner ends y of its tu mbler-sockets the width of saidgroove substantially corresponding to the diameter of the tumblers, thelongitudinally moving and rotating plug, and tumblers for said case :o5

and plug vsubstantially. as described.

I 6. The combination of the case having tu'mblers, the two-part plugwithin said case the front part thereof having tumblers and the 4rearpart of said plug having an annular no part to move longitudinally attimes, substan- `1 x 5 tially as described.

HENRY G. VO'IGHT.

lVitnesses:

T. S. BISHOP, M. S. WIARD.

